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Random RPC Latency Issues with 2003-2010 migration

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Random RPC Latency Issues with 2003-2010 migration - 17.Jul.2012 3:13:53 AM   
AdamColliss

 

Posts: 19
Joined: 8.Dec.2005
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Hi

We are in the process of migrating from our old Exchange 2003 system (single server) to a 3 server DAG (2 on main site, 1 in DR site) using a HLB to provide a CAS array.

We have got to the stage of moving a few test mailboxes across to the new system but every few days we seem to be getting a few minutes of high RPC averaged latency (this mostly occurs out of working hours when no-one is using the system). We are running a data collector set to check the RPC averaged latency and occasionally it goes up to 25+ for 10 minutes or so then goes back down to 1. Running exmon doesn't really give us an idea where the problem could lie, we've also run the ExBPA across the infrastructure a few times and found no problems. Hardware and network are both well up to the task (DAG runs on a separate replication network).

Are these occasional peaks in RPC averaged latency anything to worry about? We thought it should never go over 2?

Advice greatly appreciated!
Post #: 1
RE: Random RPC Latency Issues with 2003-2010 migration - 20.Jul.2012 8:39:45 PM   
Gigabitz

 

Posts: 85
Joined: 27.May2008
Status: offline
NEWS FLASH

EXCHANGE 2010 CAS array - One CAS array per AD Site, and a single CAS array cannot span multiple sites.

When you assigned the array to an MB database using the set-mailboxdatabase you did use the RpcClientAccess parameter correct?

Client access is different than an Exchange 2007 environment and the client access is mediated by the CAS so based on the Client versions of outlook you need to look at how your RPC encryption is setup. Once the RPC client access is corrected you will then need to look at your throttling policies.

(in reply to AdamColliss)
Post #: 2
RE: Random RPC Latency Issues with 2003-2010 migration - 23.Jul.2012 4:23:06 AM   
AdamColliss

 

Posts: 19
Joined: 8.Dec.2005
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Thanks for the reply, our DR site and main site are both in the same AD. RPCClientAccessServer is set to cas.<internal AD domain>.local. 99% of the time we have no issues at all, just random RPC spikes every few days. We are using the default throttling policies.

(in reply to Gigabitz)
Post #: 3
RE: Random RPC Latency Issues with 2003-2010 migration - 5.Aug.2012 4:36:16 AM   
Exchange_Geek

 

Posts: 1287
Joined: 31.Dec.2006
Status: offline
I tend to resort to the following articles to start off with issues.

http://blogs.technet.com/b/exchange/archive/2005/09/28/411674.aspx
http://msexchangeguru.com/2011/02/27/rpc-issues/
http://technet.microsoft.com/en-us/library/ff367871.aspx

Gather perfmon data counters to understand the variation of normal versus sluggish performance time range. If this is a particular time of the day and happens suppose 1ce or 2ce a week, you'd be more interested to check if this is an issue with a particular store / couple of users on a store / MAPI or NON-MAPI clients, likewise drill down to get more specific.

You could consider session limits of users on the store IF you conclude that users are misutilizing store limits
http://technet.microsoft.com/en-us/library/ff477612.aspx

Regards,
Exchange_Geek

(in reply to AdamColliss)
Post #: 4

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